This question has been asked many times on the forum. We should do an FAQ on it some day.
CFX uses control volumes centred on the nodes, so the nodes on the walls generate control volumes whose centroids is off the walls. That is why the wall control volumes have non-zero velocities. To make it display as expected in post processing, CFX has added the "hybrid" variables, where it forces the velocity to zero (or more generally the wall velocity) at the wall. The "conservative" variables show the actual control volume values. |
Dear Mr. Horrocks,
Thank you very much for your help and explanation. I do thing that this issue deserve a FAQ, due to its relevance. I appreciate your reply. Best regards, Ramon Silva Martins |
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